Disk sanding mechanism



Nov. 27, 1928. i

E. C. SCHACHT DISK SANDING MECHANISM 2 SheetS-Sheet 1 m M. V .f 5. mw,A.

Filed Ma 0h 1, 1926 Nov. 27, 1928. 1,693,183

E. C. SCHACHT DISK SANDING MECHANI SM F'rled March 1, 1926 2Sheets-Sheet 2 f'atented Nov. 27, 1928.

UNITED i STATES PATEN'T OFFICE.

.m C. 8mm, 01' TBOY, m YORK, SSIGHOR T mm SUBI'OING n- Om! 00. m6., 01''IB-OY, w YOBILA. OOBPOM'I'IOI 0]' m YORK.

nas: sannnro Reference maybe had to the accompany-` ing drawings, andthe reference characters marked thereon, which form a part of thisspecification.- Similar lcharacters refer to similar parts in theseveral figures therein.

The princi al objects of the invention are to simplify t e construction,and reduce the cost of disk sandin mechanisms.

Other objects wil appear in connectlon with the following description.

Fig. 1 of the drawings is a face view of a disk sandinghead embodying mylnvention with portions of the device partly broken away. I

Fig. 2 is a view in perspectiveof the clamp late whereby the abrasivedisk is secured to its rotatory support.

Fig. 3 is a view in perspective of a broken away central portion of thesupporting meta-l disk and hub forming part of the rotatory support forthe abrasive disk showing the sink or well toreceive the clamping plate.

Fig. 4 is a face view of a pa-rtly broken away abrasive disk adapted foruse in the construction shown in F ig. 1.

Fig. 5 is a central cross section of the head taken on the broken line5-5 in Fig. 1.

Referring to Fgs'. 1, 2, 3, 4 and 5,*the disk sanding head includes asupporting disk, 1, mounted upon a hub, 2; and an abrasive disk, 3,mounted 'upon the supporting disk.

The supporting disk, 1, is preferably made of flexible resilient metal,as sheet steel, and i is referably faced with a flexible sheet or bo y,4, of yielding material such as soft vulcanized rubber, or preferablyrubberized fabric similar to that of which rubber belting .is made.

This facing or covering, 4, is preferably secured upon the face of thedisk, 1, 'by means of rivets, 5; and if desired it may be of greater orsmaller diameter than vthe disk, 1,'as shown.

o he hub, 2, is secured upon the back of the supporting disk, 1, bymeansof rivets, 6, and is'formed with a central sink 'or well, 8, opposite asimilarly4 shatlaed opening, 9, formed in the disk, 1, whic sink or wellis adapted to receive a clamping plate, 10, .'-n whereby the abrasivedisk, 3, is secured to the su porting body formed by the sheet metalisk, 1, and the facing, 4. w

The hub,`2, is also rovided with a central aperture, 11, adapte toreceive the end of 5 a shaft, 12; and the clamping plate, 10, is

provided with a central aperture, 13, adapted to receive a screw, 14,whereby the clamping plate is secured to said shaft, 12, causin the disksanding head to rotate with said s aft.

The abrasive disk, 3, may be made of sand paper, emerymger, emery clothorthe like of a grade an c aracter adapted for the intended work.

The abrasive disk is preferably cut in the p form shownv in F ig. 4,with a central a ertura, 14, to receive the screw, 4 with our radlalshts, 18, extending outwardly from the central aperture, 14, and with aplurality of apertures, 15, on o posite sides of said central aperture,14, a apted to receive pins, 16, projecting from the inner side of theclamp plate, 10, which pins are ada ted to enter similarly locatedopenings, 17, in the bottom of the sink or well, 8.

The disk, 3, is thus provided with four floating tongues which convergetowa-rd the center of the disk and which are adapted to yleld to thepressure of the clamp late, 10, and be forced into and tightly t withinthe well, 8, in the hub as the clamp late, 10, is drawn tightly withinsaid we l by means of the screw, 4, with the abrasive disk mounted onthe face of the supporting disk, 1, with said floatingtongues inter osedbetween the clamp plate, 10, and the ttom of the well, 8.

The facing sheet or covering, 4, is formed with a central opening, 7,corresponding in form and size with the well, 8.

In Fig. 3, I have shown the well, 8, rectangular in form with outwardlyflaring side walls and the clamp plate, 10, of similar form with itssides, 20, similarly flared outwardly and adapted to fit within the wellwith the 'the pms, 16, on the clam plate are inserted therethrough andinto t e openings, 17, in i the well the slits will extend approximatelyto the apices of the respective corners or angles of the well,

The tongues formed by the` slits, 18, will thus be bent by the clampplate, 10, into the well along approximately straight lines extendingalong the bases of the respective tongues, as shown in Fig. 1.

By constructing and clamping the disk in the manner descnbed, the diskscan be supplied to the trade in flat form, and without other pre'aration of the central portion of the disk t an the cutting of theslits, 18, and the apertures, 14, and15.-

The shaft, 12, is rotatively mounted in a housing, 21, and has on itsinner end a bev- 'eled gear, 22, in engagement with a beveled gear, 23,on the innei` end of a flexible shaft, 24, which is also rotativelymounted in said housing. v

The housing, 21, has a handle, 25, whereby the operation of the abrasivedisk upon' the work can be Controlled.

The operation of the device is as follows: The abrasive disk, 3, havingbeen mounted upon the supporting Sheet metal disk, 1, in the mannerabovev described is rapidly rotated by means of the flexible shaft, 25,bev- 'eled gears, 23, and 24, and shaft, 12, while the head is held bythe operator with more or less of the abrasive'disk, 3, in engagement.

With the work to be abraded or polished.

By reason of the flexible resilient character of the supporting disk, 1,and flexible, character of the facing,4, the operator can by incliningor tipping the disk and by varying the pressure upon the work cause azone of What I claim as new and desire to secureby Letters Patentis--l 1. In an apparatus of the character described, the combination ofa support including ahub provided in an end face with a depression orwell of polygonal form'in a plane transverse to the hub axis, an.initially flat i abrasive disk provided with a central aperture and aserles of slits extending radially from said aperture, one for eachangle of the polygon, a clamping plate conforming in Shape to thecross-sectional formof the well in the' hub of the support, and meansfor connecting said plate and hub, including a member extending throughthe central aperture in the disk and adapted to draw the plate into saidwell, the ortions of'the disk separated by said slits b the hub well andclamped between the side walls of the latter and the plate, relativerotation'between the disk and support being positively prevented by theshape of the clamping plate and well.

In an apparatus of the Character described, the combination of a supportincludz ing a hub provided in an end face with a depression or' well' ofrectangular form in a plane transverse to the hub axis, an initiallyflat flexible disk provided with a central aperture andj four slitsextending radial y therefrom, a rectangular clamping plate of an area toextend into the Well in the hub of the support, and means for connectingsaid plate and hub including a member extending through the centralaperture in the disk and adapted to draw the plate into the wall, theslits in the disk corresponding to the diagonals of the well and theportions of the disk separated by said slits being clamped between theside walls of'the well and the plate.

In testimony whereof, I have hereunto set my hand this 18th day ofFebruary, .1926.

ELMER o. sioHAoH'r.

eing thereby drawn into

